Project HARP 16 inch Used with permission of Stephen E. Mendes - visit his Barbados Photo Gallery Credit: © Stephen E. Mendes. 94,272 bytes. 646 x 349 pixels.

Once the fundamental design flaws of the Martlet 3A vehicle were identified the system was redesigned and a new vehicle, the Martlet 3B, was created.

The Martlet 3B vehicle was similar in design to the 3A vehicle but sported several design changes intended to improve the system performance. The first major change was to replace the aluminium airframe with a alloy steel airframe in the hopes the stronger material would lead to higher mass fractions. Other improvements included the use of a larger diameter rocket motor (increasing the outer diameter to 8 inches / 20 cm) and the use of six fixed fins instead of the 3A�s four fins.

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Martlet-3A Sabot - Martlet 3A in its sabot. Martlet 3B was similar. 87,193 bytes. 656 x 287 pixels.

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The last test flights of the Martlet 3B were performed in mid-1964 after which no further work was performed by HARP on sub-calibre gun-launched rocket vehicles.

by Richard K Graf

Total Mass: 180 kg. Core Diameter: 0.2 m.

• Martlet 3B final test flight

  The last test flights of the Martlet 3B were performed in mid-1964 after which no further work was performed by HARP on sub-calibre gun-launched rocket vehicles.